And when privacy policies change, do I have to re-evaluate each time/product that may or may not be involved (since google products are sort of all merged into

And when privacy policies change, do I have to re-evaluate each time/product that may or may not be involved (since google products are sort of all merged into one)? If I do re-evaluate, and decide I no longer agree with the policy, and I delete my account is my data really gone or will the data still be there, just hidden, and part of the new policy which may give them more rights to for example sell that information? I believe facebook makes notifications of these changes, does GMail? There are lots of issues that a simple 'privacy policy' document does not solve and may that it adds.